AJ Parker Twin Zero M/80 - for which rifle?

[Patrick Chadwick]

"I am fairly sure that it was actually AJ Parker rather than Parker Hale (competitors) who made the M80".

Promo, Alan de Enfield is demonstrating British understatement. One can see in your photo that the sight is marked Alfred J. Parker!

And as it also says on the box, it is adaptable for various rifles - if you have the correct adapter - "which in your case you have not got".

Nevertheless, it's a fine specimen, and it would be worthwhile making an adapter to suit the rifle on which you wish to mount it.